Which course is best after 12th PCB BSc Agriculture or Biotechnology in career,salary,secured job,etc??

Which course is best is must be dependent on your area of interest.

Four Year B. Sc. Agriculture (Hons.) (https://www.jnujaipur.ac.in/courses/bsc-agriculture/120/) professional degree program is running in Jaipur National University, Jaipur. This degree consists of 08 semesters (04 years duration). Subjects viz Agronomy, Plant Breeding & Genetics, Plant Pathology, Entomology, Soil Science and Agricultural Chemistry, Environment Science, Horticulture, Animal Science, Fisheries, Biochemistry, Nematology, Microbiology, Agricultural Engineering, Agricultural Economics and Statistics as recommended by 5th Dean Committee of Indian Council of Agricultural Research (ICAR, an Apex body) are being taught in JNU. Basic courses like Physics, Chemistry, Computer, English are also being taught in addition to applied courses.

B.Tech. Biotechnology programme (https://www.jnujaipur.ac.in/courses/btech-biotechnology/31/) is designed to meet the ever changing scenario in the field of Biotechnology. Our major emphasis is on the practical knowledge, where students are trained in the field of Microbiology, Molecular and Recombinant DNA Technology, Bioprocess Engineering and Bioinformatics. Organization of seminars, workshops, industrial and institutional visits help the students to develop research temperament, orientation skills and to practically observe Biotechnological processes at Industrial level. Six months dissertation (Project Work) in last semester provides an opportunity for the students to work in emerging fields of Biotechnology and to get placed in core Biotech Industries. Apart from academics, participation in sports and extracurricular activities provides a holistic and enriching experience to students.

Hello Aspirant
As per your query, I would like you to know that there is nothing like best among these three fields. These all three are best in their works. It all depends on you how you make the best out of what you get. Each one of these will give you enough for your better living. Hope you find this answer useful. All the best.